AP® Human Geography · Unit 2 · Topic 2.8
Ravenstein's Laws of Migration
Ravenstein's laws say most migrants move only a short distance, with numbers dropping off sharply the farther you go, and that long moves tend to happen in stages called step migration rather than one giant leap.
E.G. Ravenstein studied migration records in nineteenth-century Britain and noticed a pattern that held up almost everywhere he looked. Most people who moved stayed close to home, resettling in a nearby town or county. Only a small number traveled very far, and the number of migrants shrank sharply as distance increased. He also noticed that long-distance migrants often did not make the full journey in one move. Instead they migrated in stages, pausing in a town, then a larger town, then finally reaching a big city. This stage-by-stage pattern is called step migration.
Step migration happens because distance costs money, information, and nerve. A family leaving a village usually does not have the savings, contacts, or confidence to leap straight to a distant capital. Moving to a nearby town first is cheaper and less risky, and it lets the family build savings and learn how city life works before trying the next, bigger jump. Picture a family leaving a farming village for a regional town, working there for a few years, then moving on to the capital once they have money and know someone already living there. Each step reduces the uncertainty of the next one.
Ravenstein's laws connect directly to the push-pull framework and to urbanization patterns seen in the demographic transition. They explain why cities grow in rings, pulling in people from the immediate countryside before drawing migrants from farther away. Cheap air travel complicates the pattern: a laborer can now fly directly from a village in the Philippines to a job in Dubai, skipping the intermediate steps Ravenstein described, since distance no longer carries the same cost in time or money that it did in his data.
Key terms
- Step migration
- Migration that happens in stages through intermediate stops rather than as one direct move to the final destination.
- Distance decay
- The pattern in which the number of migrants falls off sharply as the distance to the destination increases.
- Push-pull factors
- Conditions that drive people away from a place (push) or draw them toward a new one (pull).
- Ravenstein's laws
- A set of nineteenth-century observations describing general tendencies in how and why people migrate.
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